1	2				3
				1
6
					1
	4
2				4	6

Difficulty: Very easy (0)

2			5	1
		1			3
3			1
	6	4			2

Difficulty: Super easy (0)

1		3
				6
	2
				2
	6
			2		5

Difficulty: Very hard (0)

					1
		5			4
5	3			1
	4			3	6
4			6
2

Difficulty: Super easy (0)